So, question to 777 jockeys here: Does the 777 FMS (or any for that fact) store any previous flight plans up to a certain amount? Or is a flight plan gone once you wipe it and put the next plan in the following day say?
Most regular routes are preprogrammed and called up on demand to save having to sit and laboriously enter every waypoint. However to select and activate a new route requires
at least 4 menu options and selections ( depending what point you are in the FMS) Never heard of any occurrence as you are suggesting.